Improvement in heating-drums



UNITED STATES PATENT OEEIcE0 WILLIAM E. OATLIN AND JOSEPH HARMON, OF SHARON, WISCONSIN.

IMPROVEMENT IN HEATING-DRUMS.

Specification forming part of Letters Patent No. 150,133, dated April 218, 1874; application Sled March 19, 1874. 1

To all whom it may concern:

Be it known that we,W1LLIAn E. CATLIN and JOSEPH HARMON, both of Sharon, in the county of Valworth and State of Wisconsin, have invented a certain Improvement in Stove- Pipe Drums, of which the following is a speciication:

rlhis invention relates to that class of stovepipe drums which inolose an internal chamber, through which the air freely circulates, and is heated in its passage by the heat given oft' by the products of combustion passing up the drum, the annular space between the internal air-chamber and exterior shell of the drum being provided with .suitable divisions or deiiectors and dampers to obtain either a direct or a circuitous draft. Our improvement consists in the employment of a series of peculiarly-arranged spiral detlectors to retard the products of combustion in the tortuous flue and direct them in such a manner as to extract from them a greater portion of their heat than has heretofore been accomplished.

In the annexed drawings, Figure l is a vertical section of our improved stove-pipe drum, showing a portion of the internal air-chamber and the deilectors in elevation. Fig. 2 illus trates, in perspective,`the internal air-chamber and the surrounding spiral deilectors, as well as the vertical flue and damper for the direct draft.

The same letters of reference are used in both iigures in the designation of identical parts.

rlhe exterior shell A of the drum is preferably made of cylindrical form, and is provided with suitable caps at either end to be connected to a stove-pipe by means of short ends A1 and A2. Within the shell is placed a cylindrical chamber, B, having no communication with the surrounding space inclosed by the shell A, but communicating by pipes B1 and B2 above and below with the external atmosphere, thus permitting a free circulation of the air through the chamber. A vertical line, O, is formed in the annular space between the chamber B and shell A, through which the smoke, Smc., entering the drum through pipe A1, may pass in straight lines, and a direct draft be maintained. Ada1nper,D,operated by a rod, d, from the outside of the drum, controls the lower end of the vertical flue O, by closing which the smoke is compelled to pass up outside ot' the flanges c, 'forming the sides of the ilue G. In thus rising in the space outside said tlue C the smoke, &c., rst strike two spirally-arranged deilectors, E and E', so located as to divide the body of the smoke into three currents. The side currents rising above these deiiectors are caught by two other deiiectors, F and F', which give to them a downward direction toward the center current, with which they unite and pass up to the uppermost centrally-located spiral deilector G, by which the united currents are again divided before they reach the upper end of the drum, and pass off through the pipe A2. By thus alternately dividing and concentra-ting the products of combustion as they pass through the tortuous ue of the drum, it is found that a very large percentage of their heat is eX tracted from them, and utilized in heating the air circulating through the chamber B, which may be taken either from the room or from outside, and discharged anywhere where wanted.

What we claim as our invention, and desire In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses. v

wM. E. oATLrN. JosErH HAEMoN.

' Witnesses:

H. D. UNDERHILL,

B. G. LYMAN. 

